Hi Joann,
What could be better than a day in "The Happiest Place on Earth"? Well, for certain, I'd say five days of magic!
First, let me say kudos to you for looking to make theme park reservations to visit
Disneyland Park and
Disney California Adventure Park.
I think the best idea I can suggest to you is to keep checking the
"Theme Park Tickets & Reservations" page and look at the "Make Park Reservations" button. It will take you to the feature to make theme park reservations for theme park tickets you have already purchased.
You can also take a look at the
Theme Park Reservation Availability calendar. You might see reservations available to choose either Disneyland Park or Disney California Adventure Park as your starting park.
You might also want to consider Park Hopper tickets, and that would give you the opportunity to visit Disneyland Park even if you're starting your day in Disney California Adventure Park.
Let me also quickly address your question about changing a theme park reservation. Theme park reservations can be made, and they can be cancelled, but theme park reservations cannot be changed or modified. The steps you could follow would be to cancel your existing theme park reservation and make a new theme park reservation. The way to cancel your theme park reservation is to go through your
"My Theme Park Reservations" page in your Disney account.
Joann, I do hope these tips are helpful. Please do come back to see us here at planDisney if you have more questions or if you're looking for more recommendations.
Here's to your great, big, beautiful tomorrow at the Disneyland Resort!
Jerry